To Increase or replace?

[DaYteX]

Hi Guys,
I'm doing a little mini upgrade on my machine and I'm wondering if I should replace my ram or increase it.
I currently have 16gb corsair dominator platinum 3200mhz 8x2, should I add another 16gb or the same ram, this will cost about £100 or replace it for something like 4000mhz? Maximum I'd want to spend is about £130 to £150. What would give me the best return on the money?

Rest of my specs
I7-8700k
RX 5700xt
Asrock taichi z390

Thanks for the help

 

[DaYteX]

I guess I don't, was thinking it might help some how.

I'll put the money towards a new monitor instead. Thanks for your help